ubuntu换源更新失败：The following signatures couldn‘t be verified because the public key is not available

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本文介绍了解决Ubuntu换源后更新失败的问题，提供了修改签名验证及更换稳定源的方法，并附带了配置DNS解决连接问题的步骤。

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Ubuntu换源error：The following signatures couldn’t be verified because the public key is not available

Ubuntu换源后执行sudo apt update后出现错误：

修改方法：
1、 sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 5523BAEEB01FA116 其中的5523BAEEB01FA116是根据错误提示写的
2、重新执行sudo apt update 即可

注：有时候下载软件时会出现连接不上源，如：Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?可能的原因是source源有问题
修改方法：1、换源
/etc/apt/sources.list 的内容先复制，然后重新将/etc/apt/sources.list 的内容换成阿里或者清华、中科大等的源。
然后执行 sudo apt update
2、修改/etc/resolv.conf 文件
在里面添加 nameserver 8.8.8.8

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